Fake Flake

Snowflake street decoration with incorrect octagonal (rather than hexagonal) symmetry. Washington, D.C., 2017.

Photo by I. Peterson

Giant Steps

Giant Steps by Enrico Riley. Virginia Museum of Fine Arts, Richmond, Virginia, 2017.

Photo by I. Peterson

Trapezoid Stool

"Rotating Shapes" stool, created by Mary Elizabeth Yarborough. Exploratorium, San Francisco, California, 2013.

See also "Triangle Seat."

Photo by I. Peterson

Torus Coloring

Seven-color tori knit by sarah-marie belcastro (left) and Carolyn Yackel (right). Mathematical Art Exhibit, MAA MathFest, San Jose, California, 2007.

Photo by I.Peterson

Star Dodecahedron

Dodecahedron I: Small Stellated Dodecahedron by Valdimir Bulatov. Exhibition of Mathematical Art, Joint Mathematics Meetings, San Diego, California, 2008.

Photo by I. Peterson

Gold Carpet

A tree-centered distribution of leaves. What can you say about the conditions under which the leaves fell? Washington, D.C., 2017.

Photo by I. Peterson

Sawdust Distributions

What caused this pattern of spaced sawdust clumps, diminishing in size to the left? Washington, D.C., 2017.

More clues.

Photos by I. Peterson

Sweeping Up

Gargoyle, Wells Cathedral, England, 1975.

Photo by I. Peterson

Wintry Slope

Kingston, Ontario, 1974.

Photo by I. Peterson

Wood Stain

Sarah Lawrence College, Bronxville, New York, 2009.

Photo by I. Peterson

Lotus Blooms

Minneapolis Sculpture Garden, Minneapolis, Minnesota, 2012.

Photo by I. Peterson

Mountain Mists

Great Smoky Mountains National Park, Tennessee, 1981.

Photo by I. Peterson

White Yellow Black

Building decoration, Toronto, Ontario, 2006.

Photo by I. Peterson

Golden Triangle

Banner with logo of the Golden Triangle Business Improvement District: Moebius strip,or not?. Washington, D.C., 2017.

See also "Impossible Logo."

Photo by I. Peterson

Gold Tree

Gunston Hall, Mason Neck, Virginia, 1982.

Photo by I. Peterson

Mace Moebius

Mace Moebius by Charles O. Perry. Crystal City, Virginia, 2000.

See also "Mobius Continuum" and "Moebius Eclipse." 

Photo by I. Peterson

Ear on the Sky

Green Bank, West Virginia, 1977.

Photo by I.Peterson

Soliton

Soliton by Bathsheba Grossman.

See also "Intersecting Tetrahedra with a Twist" and "Chiralized Tetrahedron."

Photo by I. Peterson

Hypercube Model

Constructed from seven square cylinders, each made from a strip of four squares, this model of an unfolded hypercube, created by Thomas F. Banchoff, collapses into a flat, two-dimensional configuration.

Photos by I. Peterson

Crinkled Torus

Crinkled torus by William T. Webber.

A properly creased, rectangular sheet can be turned into a crinkled torus shape.

Photos by I. Peterson; model by William T. Webber.

Shoreline Reflection

Winona, Minnesota, 2008.

Photos by I. Peterson

Wooster Autumn

Kauke Hall. College of Wooster, Wooster, Ohio, 2009.

Photo by I. Peterson

Yellowstone Geyser

Yellowstone National Park, Wyoming, 1977.

Photo by I. Peterson

Potomac View

View of the Potomac River from the lawn of George Washington's Mount Vernon. Mount Vernon, Virginia, 1981.

Photo by I. Peterson

Valley Forge Vista

Valley Forge National Historical Park, Pennsylvania, 1979.

Photo by I. Peterson

Silver Leaves

Bloor Parkette (southeast corner of Bloor Street West and Spadina Avenue), Toronto, Ontario, 2009.

See also "Leaf on Leaf."

Photos by I. Peterson

Fall Fungus

Photo by I. Peterson

Mimosa Burst

Mimosa tree (Persian silk tree) blossom.

Photo by I. Peterson

Diamond Tree

Geometric diamond grid pattern overlaid on fractal-like tree branches. Ottawa, Ontario, 1974.

Photo by I. Peterson

Lake Firs

Northwestern Ontario, 1977.

Photo by I. Peterson